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package forms
import (
"fmt"
"math"
"github.com/la5nta/pat/internal/gpsd"
"github.com/pd0mz/go-maidenhead"
)
type gpsStyle int
const (
// documentation: https://www.winlink.org/sites/default/files/RMSE_FORMS/insertion_tags.zip
signedDecimal gpsStyle = iota // 41.1234 -73.4567
decimal // 46.3795N 121.5835W
degreeMinute // 46-22.77N 121-35.01W
gridSquare // JO29PJ
)
func positionFmt(style gpsStyle, pos gpsd.Position) string {
const notAvailable = "(Not available)"
var (
northing string
easting string
latDegrees int
latMinutes float64
lonDegrees int
lonMinutes float64
)
noPos := gpsd.Position{}
if pos == noPos {
return notAvailable
}
switch style {
case gridSquare:
str, err := maidenhead.NewPoint(pos.Lat, pos.Lon).GridSquare()
if err != nil {
return notAvailable
}
return str
case degreeMinute:
{
latDegrees = int(math.Trunc(math.Abs(pos.Lat)))
latMinutes = (math.Abs(pos.Lat) - float64(latDegrees)) * 60
lonDegrees = int(math.Trunc(math.Abs(pos.Lon)))
lonMinutes = (math.Abs(pos.Lon) - float64(lonDegrees)) * 60
}
fallthrough
case decimal:
{
if pos.Lat >= 0 {
northing = "N"
} else {
northing = "S"
}
if pos.Lon >= 0 {
easting = "E"
} else {
easting = "W"
}
}
}
switch style {
case signedDecimal:
return fmt.Sprintf("%.4f %.4f", pos.Lat, pos.Lon)
case decimal:
return fmt.Sprintf("%.4f%s %.4f%s", math.Abs(pos.Lat), northing, math.Abs(pos.Lon), easting)
case degreeMinute:
return fmt.Sprintf("%02d-%05.2f%s %03d-%05.2f%s", latDegrees, latMinutes, northing, lonDegrees, lonMinutes, easting)
default:
panic("invalid style")
}
}
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